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Montana Natural Streambed and Land Preservation Act: 310-Law

The Natural Streambed and Land Preservation Act, also known as the 310 Law,  requires any individual or business proposing work in or near a perennial stream to apply for a 310 permit through their local conservation district.

If you are planning a project in or around a stream, this law pertains to you.

Cross section of a stream depicting different hydraulic features used by the Flathead Conservation District to determine when a project will require a 310 permit.

The Flathead Conservation District administers 310 permits on over 600 streams within Flathead County. Each stream is unique, requiring its own considerations for maintaining health and function. 310 permits are required to ensure wise use of our natural resources and prevent degradation of our streams. Permits are required in any area, which when physically altered or modified, has the potential to affect a stream or its channel. Because each stream and each project are different, permit requirements are assessed on the ground during a site visit by District Supervisors and Fish Wildlife and Parks staff.

To learn more, visit our Frequently Asked Questions page.

View all our forms and applications or a printer-friendly fact sheet.

Read the Adopted Rules for specific permit requirements and standards.

Read more about the history of Conservation Districts and the 310 Law.

Read more about stream permitting required by other agencies.

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